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Merge tag 'for-5.18/io_uring-2022-04-01' of git://git.kernel.dk/linux-block
[linux.git] / fs / nfs / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <[email protected]>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
6f43ddcc 41#include <linux/kernel.h>
1da177e4 42#include <linux/slab.h>
b89f4321 43#include <linux/fs.h>
1da177e4 44#include <linux/nfs_fs.h>
5043e900
TM		 45#include <linux/kthread.h>
46#include <linux/module.h>
9f958ab8 47#include <linux/random.h>
8c7597f6 48#include <linux/ratelimit.h>
1da177e4
LT		 49#include <linux/workqueue.h>
50#include <linux/bitops.h>
0aaaf5c4 51#include <linux/jiffies.h>
3e17898a 52#include <linux/sched/mm.h>
1da177e4 53
05f4c350
CL		 54#include <linux/sunrpc/clnt.h>
55
4ce79717 56#include "nfs4_fs.h"
1da177e4
LT		 57#include "callback.h"
58#include "delegation.h"
24c8dbbb 59#include "internal.h"
40c64c26 60#include "nfs4idmap.h"
76e697ba 61#include "nfs4session.h"
974cec8c 62#include "pnfs.h"
bbe0a3aa 63#include "netns.h"
511ba52e 64#include "nfs4trace.h"
1da177e4 65
e3c0fb7e
CL		 66#define NFSDBG_FACILITY NFSDBG_STATE
67
1da177e4
LT		 68#define OPENOWNER_POOL_SIZE 8
69
93b717fd 70const nfs4_stateid zero_stateid = {
e0714ec4 71 { .data = { 0 } },
93b717fd
TM		 72 .type = NFS4_SPECIAL_STATEID_TYPE,
73};
fcd8843c
TM		 74const nfs4_stateid invalid_stateid = {
75 {
445f288d
TM		 76 /* Funky initialiser keeps older gcc versions happy */
77 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
fcd8843c
TM		 78 },
79 .type = NFS4_INVALID_STATEID_TYPE,
80};
81
2409a976
FI		 82const nfs4_stateid current_stateid = {
83 {
84 /* Funky initialiser keeps older gcc versions happy */
85 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
86 },
87 .type = NFS4_SPECIAL_STATEID_TYPE,
88};
89
05f4c350 90static DEFINE_MUTEX(nfs_clid_init_mutex);
1da177e4 91
5b596830
DB		 92static int nfs4_setup_state_renewal(struct nfs_client *clp)
93{
94 int status;
95 struct nfs_fsinfo fsinfo;
5b596830
DB		 96
97 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
98 nfs4_schedule_state_renewal(clp);
99 return 0;
100 }
101
5b596830
DB		 102 status = nfs4_proc_get_lease_time(clp, &fsinfo);
103 if (status == 0) {
7dc2993a 104 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ);
5b596830
DB		 105 nfs4_schedule_state_renewal(clp);
106 }
107
108 return status;
109}
110
a52458b4 111int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
1da177e4 112{
fd954ae1
TM		 113 struct nfs4_setclientid_res clid = {
114 .clientid = clp->cl_clientid,
115 .confirm = clp->cl_confirm,
116 };
f738f517
CL		 117 unsigned short port;
118 int status;
bbe0a3aa 119 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
f738f517 120
fd954ae1
TM		 121 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
122 goto do_confirm;
bbe0a3aa 123 port = nn->nfs_callback_tcpport;
f738f517 124 if (clp->cl_addr.ss_family == AF_INET6)
29dcc16a 125 port = nn->nfs_callback_tcpport6;
f738f517 126
bb8b27e5
TM		 127 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
128 if (status != 0)
129 goto out;
fd954ae1
TM		 130 clp->cl_clientid = clid.clientid;
131 clp->cl_confirm = clid.confirm;
132 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
133do_confirm:
bb8b27e5
TM		 134 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
135 if (status != 0)
136 goto out;
fd954ae1 137 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
5b596830 138 nfs4_setup_state_renewal(clp);
bb8b27e5 139out:
1da177e4
LT		 140 return status;
141}
142
05f4c350
CL		 143/**
144 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
145 *
146 * @clp: nfs_client under test
147 * @result: OUT: found nfs_client, or clp
148 * @cred: credential to use for trunking test
149 *
150 * Returns zero, a negative errno, or a negative NFS4ERR status.
151 * If zero is returned, an nfs_client pointer is planted in
152 * "result".
153 *
154 * Note: The returned client may not yet be marked ready.
155 */
156int nfs40_discover_server_trunking(struct nfs_client *clp,
157 struct nfs_client **result,
a52458b4 158 const struct cred *cred)
05f4c350
CL		 159{
160 struct nfs4_setclientid_res clid = {
161 .clientid = clp->cl_clientid,
162 .confirm = clp->cl_confirm,
163 };
9f62387d 164 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
05f4c350
CL		 165 unsigned short port;
166 int status;
167
9f62387d 168 port = nn->nfs_callback_tcpport;
05f4c350 169 if (clp->cl_addr.ss_family == AF_INET6)
9f62387d 170 port = nn->nfs_callback_tcpport6;
05f4c350
CL		 171
172 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
173 if (status != 0)
174 goto out;
175 clp->cl_clientid = clid.clientid;
176 clp->cl_confirm = clid.confirm;
177
178 status = nfs40_walk_client_list(clp, result, cred);
202c312d 179 if (status == 0) {
05f4c350
CL		 180 /* Sustain the lease, even if it's empty. If the clientid4
181 * goes stale it's of no use for trunking discovery. */
182 nfs4_schedule_state_renewal(*result);
f02f3755
Z		 183
184 /* If the client state need to recover, do it. */
185 if (clp->cl_state)
186 nfs4_schedule_state_manager(clp);
05f4c350 187 }
05f4c350
CL		 188out:
189 return status;
190}
191
a52458b4 192const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
a2b2bb88 193{
a52458b4 194 return get_cred(rpc_machine_cred());
a2b2bb88
TM		 195}
196
d688f7b8
CL		 197static void nfs4_root_machine_cred(struct nfs_client *clp)
198{
d688f7b8 199
5e16923b
N		 200 /* Force root creds instead of machine */
201 clp->cl_principal = NULL;
202 clp->cl_rpcclient->cl_principal = NULL;
d688f7b8
CL		 203}
204
a52458b4 205static const struct cred *
24d292b8 206nfs4_get_renew_cred_server_locked(struct nfs_server *server)
b4454fe1 207{
a52458b4 208 const struct cred *cred = NULL;
b4454fe1 209 struct nfs4_state_owner *sp;
9f958ab8 210 struct rb_node *pos;
b4454fe1 211
24d292b8
CL		 212 for (pos = rb_first(&server->state_owners);
213 pos != NULL;
214 pos = rb_next(pos)) {
215 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
b4454fe1
TM		 216 if (list_empty(&sp->so_states))
217 continue;
a52458b4 218 cred = get_cred(sp->so_cred);
b4454fe1
TM		 219 break;
220 }
221 return cred;
222}
223
24d292b8 224/**
f15e1e8b 225 * nfs4_get_renew_cred - Acquire credential for a renew operation
24d292b8
CL		 226 * @clp: client state handle
227 *
228 * Returns an rpc_cred with reference count bumped, or NULL.
229 * Caller must hold clp->cl_lock.
230 */
a52458b4 231const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
24d292b8 232{
a52458b4 233 const struct cred *cred = NULL;
24d292b8
CL		 234 struct nfs_server *server;
235
e49a29bd 236 /* Use machine credentials if available */
f15e1e8b 237 cred = nfs4_get_machine_cred(clp);
e49a29bd
SP		 238 if (cred != NULL)
239 goto out;
240
f15e1e8b 241 spin_lock(&clp->cl_lock);
24d292b8
CL		 242 rcu_read_lock();
243 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
244 cred = nfs4_get_renew_cred_server_locked(server);
245 if (cred != NULL)
246 break;
247 }
248 rcu_read_unlock();
f15e1e8b 249 spin_unlock(&clp->cl_lock);
e49a29bd
SP		 250
251out:
24d292b8
CL		 252 return cred;
253}
254
62f288a0 255static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
9dfdf404 256{
774d5f14 257 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
961a828d 258 spin_lock(&tbl->slot_tbl_lock);
b75ad4cd 259 nfs41_wake_slot_table(tbl);
961a828d 260 spin_unlock(&tbl->slot_tbl_lock);
689cf5c1 261 }
9dfdf404
RL		 262}
263
62f288a0
AA		 264static void nfs4_end_drain_session(struct nfs_client *clp)
265{
266 struct nfs4_session *ses = clp->cl_session;
267
2cf8bca8
CL		 268 if (clp->cl_slot_tbl) {
269 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
270 return;
271 }
272
62f288a0
AA		 273 if (ses != NULL) {
274 nfs4_end_drain_slot_table(&ses->bc_slot_table);
275 nfs4_end_drain_slot_table(&ses->fc_slot_table);
276 }
277}
278
774d5f14 279static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
9dfdf404 280{
774d5f14 281 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
9dfdf404 282 spin_lock(&tbl->slot_tbl_lock);
b6bf6e7d 283 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
16735d02 284 reinit_completion(&tbl->complete);
9dfdf404 285 spin_unlock(&tbl->slot_tbl_lock);
42acd021 286 return wait_for_completion_interruptible(&tbl->complete);
9dfdf404
RL		 287 }
288 spin_unlock(&tbl->slot_tbl_lock);
289 return 0;
290}
291
42acd021
AA		 292static int nfs4_begin_drain_session(struct nfs_client *clp)
293{
294 struct nfs4_session *ses = clp->cl_session;
8aafd2fd 295 int ret;
42acd021 296
2cf8bca8
CL		 297 if (clp->cl_slot_tbl)
298 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
299
42acd021 300 /* back channel */
774d5f14 301 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
42acd021
AA		 302 if (ret)
303 return ret;
304 /* fore channel */
774d5f14 305 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
42acd021
AA		 306}
307
c9fdeb28
CL		 308#if defined(CONFIG_NFS_V4_1)
309
bda197f5
TM		 310static void nfs41_finish_session_reset(struct nfs_client *clp)
311{
312 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
313 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
314 /* create_session negotiated new slot table */
bda197f5 315 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
ea51efaa 316 nfs4_setup_state_renewal(clp);
bda197f5
TM		 317}
318
a52458b4 319int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
4d643d1d
AA		 320{
321 int status;
322
fd954ae1
TM		 323 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
324 goto do_confirm;
4d643d1d 325 status = nfs4_proc_exchange_id(clp, cred);
9430fb6b
RL		 326 if (status != 0)
327 goto out;
fd954ae1
TM		 328 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
329do_confirm:
848f5bda 330 status = nfs4_proc_create_session(clp, cred);
9430fb6b
RL		 331 if (status != 0)
332 goto out;
bda197f5 333 nfs41_finish_session_reset(clp);
9430fb6b
RL		 334 nfs_mark_client_ready(clp, NFS_CS_READY);
335out:
4d643d1d
AA		 336 return status;
337}
338
05f4c350
CL		 339/**
340 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
341 *
342 * @clp: nfs_client under test
343 * @result: OUT: found nfs_client, or clp
344 * @cred: credential to use for trunking test
345 *
346 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
347 * If NFS4_OK is returned, an nfs_client pointer is planted in
348 * "result".
349 *
350 * Note: The returned client may not yet be marked ready.
351 */
352int nfs41_discover_server_trunking(struct nfs_client *clp,
353 struct nfs_client **result,
a52458b4 354 const struct cred *cred)
05f4c350
CL		 355{
356 int status;
357
358 status = nfs4_proc_exchange_id(clp, cred);
359 if (status != NFS4_OK)
360 return status;
361
48d66b97
TM		 362 status = nfs41_walk_client_list(clp, result, cred);
363 if (status < 0)
364 return status;
365 if (clp != *result)
366 return 0;
367
8dcbec6d
CL		 368 /*
369 * Purge state if the client id was established in a prior
370 * instance and the client id could not have arrived on the
371 * server via Transparent State Migration.
372 */
373 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
374 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
375 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
376 else
377 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
378 }
48d66b97
TM		 379 nfs4_schedule_state_manager(clp);
380 status = nfs_wait_client_init_complete(clp);
381 if (status < 0)
382 nfs_put_client(clp);
383 return status;
05f4c350
CL		 384}
385
b4b82607
AA		 386#endif /* CONFIG_NFS_V4_1 */
387
24d292b8 388/**
73d8bde5 389 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
24d292b8
CL		 390 * @clp: client state handle
391 *
a52458b4 392 * Returns a cred with reference count bumped, or NULL.
24d292b8 393 */
a52458b4 394const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
24d292b8 395{
a52458b4 396 const struct cred *cred;
286d7d6a 397
f15e1e8b 398 cred = nfs4_get_machine_cred(clp);
a2b2bb88 399 return cred;
286d7d6a
TM		 400}
401
1da177e4 402static struct nfs4_state_owner *
a52458b4 403nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
1da177e4 404{
24d292b8 405 struct rb_node **p = &server->state_owners.rb_node,
9f958ab8 406 *parent = NULL;
414adf14 407 struct nfs4_state_owner *sp;
a52458b4 408 int cmp;
1da177e4 409
9f958ab8
TM		 410 while (*p != NULL) {
411 parent = *p;
24d292b8 412 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
a52458b4 413 cmp = cred_fscmp(cred, sp->so_cred);
9f958ab8 414
a52458b4 415 if (cmp < 0)
9f958ab8 416 p = &parent->rb_left;
a52458b4 417 else if (cmp > 0)
9f958ab8
TM		 418 p = &parent->rb_right;
419 else {
0aaaf5c4
CL		 420 if (!list_empty(&sp->so_lru))
421 list_del_init(&sp->so_lru);
9f958ab8 422 atomic_inc(&sp->so_count);
414adf14 423 return sp;
9f958ab8 424 }
1da177e4 425 }
414adf14 426 return NULL;
1da177e4
LT		 427}
428
9f958ab8 429static struct nfs4_state_owner *
24d292b8 430nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
9f958ab8 431{
24d292b8
CL		 432 struct nfs_server *server = new->so_server;
433 struct rb_node **p = &server->state_owners.rb_node,
9f958ab8
TM		 434 *parent = NULL;
435 struct nfs4_state_owner *sp;
a52458b4 436 int cmp;
9f958ab8
TM		 437
438 while (*p != NULL) {
439 parent = *p;
24d292b8 440 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
a52458b4 441 cmp = cred_fscmp(new->so_cred, sp->so_cred);
9f958ab8 442
a52458b4 443 if (cmp < 0)
9f958ab8 444 p = &parent->rb_left;
a52458b4 445 else if (cmp > 0)
9f958ab8
TM		 446 p = &parent->rb_right;
447 else {
0aaaf5c4
CL		 448 if (!list_empty(&sp->so_lru))
449 list_del_init(&sp->so_lru);
9f958ab8
TM		 450 atomic_inc(&sp->so_count);
451 return sp;
452 }
453 }
24d292b8
CL		 454 rb_link_node(&new->so_server_node, parent, p);
455 rb_insert_color(&new->so_server_node, &server->state_owners);
9f958ab8
TM		 456 return new;
457}
458
459static void
24d292b8 460nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
9f958ab8 461{
24d292b8
CL		 462 struct nfs_server *server = sp->so_server;
463
464 if (!RB_EMPTY_NODE(&sp->so_server_node))
465 rb_erase(&sp->so_server_node, &server->state_owners);
9f958ab8
TM		 466}
467
7ba127ab
TM		 468static void
469nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
470{
95b72eb0 471 sc->create_time = ktime_get();
7ba127ab
TM		 472 sc->flags = 0;
473 sc->counter = 0;
474 spin_lock_init(&sc->lock);
475 INIT_LIST_HEAD(&sc->list);
476 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
477}
478
479static void
480nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
481{
482 rpc_destroy_wait_queue(&sc->wait);
483}
484
1da177e4
LT		 485/*
486 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
487 * create a new state_owner.
488 *
489 */
490static struct nfs4_state_owner *
d1e284d5 491nfs4_alloc_state_owner(struct nfs_server *server,
a52458b4 492 const struct cred *cred,
d1e284d5 493 gfp_t gfp_flags)
1da177e4
LT		 494{
495 struct nfs4_state_owner *sp;
496
d1e284d5 497 sp = kzalloc(sizeof(*sp), gfp_flags);
1da177e4
LT		 498 if (!sp)
499 return NULL;
aae5730e
MW		 500 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
501 gfp_flags);
502 if (sp->so_seqid.owner_id < 0) {
503 kfree(sp);
504 return NULL;
505 }
d1e284d5 506 sp->so_server = server;
a52458b4 507 sp->so_cred = get_cred(cred);
ec073428 508 spin_lock_init(&sp->so_lock);
1da177e4 509 INIT_LIST_HEAD(&sp->so_states);
7ba127ab 510 nfs4_init_seqid_counter(&sp->so_seqid);
1da177e4 511 atomic_set(&sp->so_count, 1);
0aaaf5c4 512 INIT_LIST_HEAD(&sp->so_lru);
76246c92 513 seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock);
65b62a29 514 mutex_init(&sp->so_delegreturn_mutex);
1da177e4
LT		 515 return sp;
516}
517
1d2e88e7 518static void
86cfb041 519nfs4_reset_state_owner(struct nfs4_state_owner *sp)
1da177e4 520{
86cfb041
N		 521 /* This state_owner is no longer usable, but must
522 * remain in place so that state recovery can find it
523 * and the opens associated with it.
524 * It may also be used for new 'open' request to
525 * return a delegation to the server.
526 * So update the 'create_time' so that it looks like
527 * a new state_owner. This will cause the server to
528 * request an OPEN_CONFIRM to start a new sequence.
529 */
530 sp->so_seqid.create_time = ktime_get();
1da177e4
LT		 531}
532
0aaaf5c4
CL		 533static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
534{
7ba127ab 535 nfs4_destroy_seqid_counter(&sp->so_seqid);
a52458b4 536 put_cred(sp->so_cred);
aae5730e 537 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
0aaaf5c4
CL		 538 kfree(sp);
539}
540
541static void nfs4_gc_state_owners(struct nfs_server *server)
542{
543 struct nfs_client *clp = server->nfs_client;
544 struct nfs4_state_owner *sp, *tmp;
545 unsigned long time_min, time_max;
546 LIST_HEAD(doomed);
547
548 spin_lock(&clp->cl_lock);
549 time_max = jiffies;
550 time_min = (long)time_max - (long)clp->cl_lease_time;
551 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
552 /* NB: LRU is sorted so that oldest is at the head */
553 if (time_in_range(sp->so_expires, time_min, time_max))
554 break;
555 list_move(&sp->so_lru, &doomed);
556 nfs4_remove_state_owner_locked(sp);
557 }
558 spin_unlock(&clp->cl_lock);
559
560 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
561 list_del(&sp->so_lru);
562 nfs4_free_state_owner(sp);
563 }
564}
565
24d292b8
CL		 566/**
567 * nfs4_get_state_owner - Look up a state owner given a credential
568 * @server: nfs_server to search
569 * @cred: RPC credential to match
302fad7b 570 * @gfp_flags: allocation mode
24d292b8
CL		 571 *
572 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
573 */
574struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
a52458b4 575 const struct cred *cred,
d1e284d5 576 gfp_t gfp_flags)
1da177e4 577{
7539bbab 578 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 579 struct nfs4_state_owner *sp, *new;
580
1da177e4 581 spin_lock(&clp->cl_lock);
24d292b8 582 sp = nfs4_find_state_owner_locked(server, cred);
1da177e4 583 spin_unlock(&clp->cl_lock);
1da177e4 584 if (sp != NULL)
0aaaf5c4 585 goto out;
d1e284d5 586 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
9f958ab8 587 if (new == NULL)
0aaaf5c4 588 goto out;
aae5730e
MW		 589 spin_lock(&clp->cl_lock);
590 sp = nfs4_insert_state_owner_locked(new);
591 spin_unlock(&clp->cl_lock);
d1e284d5
TM		 592 if (sp != new)
593 nfs4_free_state_owner(new);
0aaaf5c4
CL		 594out:
595 nfs4_gc_state_owners(server);
9f958ab8 596 return sp;
1da177e4
LT		 597}
598
24d292b8
CL		 599/**
600 * nfs4_put_state_owner - Release a nfs4_state_owner
601 * @sp: state owner data to release
7bf97bc2
TM		 602 *
603 * Note that we keep released state owners on an LRU
604 * list.
605 * This caches valid state owners so that they can be
606 * reused, to avoid the OPEN_CONFIRM on minor version 0.
607 * It also pins the uniquifier of dropped state owners for
608 * a while, to ensure that those state owner names are
609 * never reused.
24d292b8 610 */
1da177e4
LT		 611void nfs4_put_state_owner(struct nfs4_state_owner *sp)
612{
0aaaf5c4
CL		 613 struct nfs_server *server = sp->so_server;
614 struct nfs_client *clp = server->nfs_client;
1da177e4
LT		 615
616 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
617 return;
0aaaf5c4 618
7bf97bc2
TM		 619 sp->so_expires = jiffies;
620 list_add_tail(&sp->so_lru, &server->state_owners_lru);
621 spin_unlock(&clp->cl_lock);
0aaaf5c4
CL		 622}
623
624/**
625 * nfs4_purge_state_owners - Release all cached state owners
626 * @server: nfs_server with cached state owners to release
c77e2283 627 * @head: resulting list of state owners
0aaaf5c4
CL		 628 *
629 * Called at umount time. Remaining state owners will be on
630 * the LRU with ref count of zero.
c77e2283
TM		 631 * Note that the state owners are not freed, but are added
632 * to the list @head, which can later be used as an argument
633 * to nfs4_free_state_owners.
0aaaf5c4 634 */
c77e2283 635void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
0aaaf5c4
CL		 636{
637 struct nfs_client *clp = server->nfs_client;
638 struct nfs4_state_owner *sp, *tmp;
0aaaf5c4
CL		 639
640 spin_lock(&clp->cl_lock);
641 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
c77e2283 642 list_move(&sp->so_lru, head);
0aaaf5c4
CL		 643 nfs4_remove_state_owner_locked(sp);
644 }
1da177e4 645 spin_unlock(&clp->cl_lock);
c77e2283 646}
0aaaf5c4 647
c77e2283 648/**
6453bcd0 649 * nfs4_free_state_owners - Release all cached state owners
c77e2283
TM		 650 * @head: resulting list of state owners
651 *
652 * Frees a list of state owners that was generated by
653 * nfs4_purge_state_owners
654 */
655void nfs4_free_state_owners(struct list_head *head)
656{
657 struct nfs4_state_owner *sp, *tmp;
658
659 list_for_each_entry_safe(sp, tmp, head, so_lru) {
0aaaf5c4
CL		 660 list_del(&sp->so_lru);
661 nfs4_free_state_owner(sp);
662 }
1da177e4
LT		 663}
664
665static struct nfs4_state *
666nfs4_alloc_open_state(void)
667{
668 struct nfs4_state *state;
669
9c00fd9a 670 state = kzalloc(sizeof(*state), GFP_KERNEL_ACCOUNT);
1da177e4
LT		 671 if (!state)
672 return NULL;
ace9fad4 673 refcount_set(&state->count, 1);
1da177e4 674 INIT_LIST_HEAD(&state->lock_states);
8d0a8a9d 675 spin_lock_init(&state->state_lock);
8bda4e4c 676 seqlock_init(&state->seqlock);
c9399f21 677 init_waitqueue_head(&state->waitq);
1da177e4
LT		 678 return state;
679}
680
4cecb76f 681void
dc0b027d 682nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
4cecb76f 683{
dc0b027d 684 if (state->state == fmode)
4cecb76f
TM		 685 return;
686 /* NB! List reordering - see the reclaim code for why. */
dc0b027d
TM		 687 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
688 if (fmode & FMODE_WRITE)
4cecb76f
TM		 689 list_move(&state->open_states, &state->owner->so_states);
690 else
691 list_move_tail(&state->open_states, &state->owner->so_states);
692 }
dc0b027d 693 state->state = fmode;
4cecb76f
TM		 694}
695
1da177e4
LT		 696static struct nfs4_state *
697__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
698{
699 struct nfs_inode *nfsi = NFS_I(inode);
700 struct nfs4_state *state;
701
9ae075fd 702 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
1c816efa 703 if (state->owner != owner)
1da177e4 704 continue;
5d422301
TM		 705 if (!nfs4_valid_open_stateid(state))
706 continue;
ace9fad4 707 if (refcount_inc_not_zero(&state->count))
1da177e4 708 return state;
1da177e4
LT		 709 }
710 return NULL;
711}
712
1da177e4
LT		 713static void
714nfs4_free_open_state(struct nfs4_state *state)
715{
9ae075fd 716 kfree_rcu(state, rcu_head);
1da177e4
LT		 717}
718
719struct nfs4_state *
720nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
721{
722 struct nfs4_state *state, *new;
723 struct nfs_inode *nfsi = NFS_I(inode);
724
9ae075fd 725 rcu_read_lock();
1da177e4 726 state = __nfs4_find_state_byowner(inode, owner);
9ae075fd 727 rcu_read_unlock();
1da177e4
LT		 728 if (state)
729 goto out;
730 new = nfs4_alloc_open_state();
ec073428 731 spin_lock(&owner->so_lock);
1da177e4
LT		 732 spin_lock(&inode->i_lock);
733 state = __nfs4_find_state_byowner(inode, owner);
734 if (state == NULL && new != NULL) {
735 state = new;
1da177e4
LT		 736 state->owner = owner;
737 atomic_inc(&owner->so_count);
0444d76a
DC		 738 ihold(inode);
739 state->inode = inode;
29fe8399 740 list_add_rcu(&state->inode_states, &nfsi->open_states);
1da177e4 741 spin_unlock(&inode->i_lock);
ec073428
TM		 742 /* Note: The reclaim code dictates that we add stateless
743 * and read-only stateids to the end of the list */
744 list_add_tail(&state->open_states, &owner->so_states);
745 spin_unlock(&owner->so_lock);
1da177e4
LT		 746 } else {
747 spin_unlock(&inode->i_lock);
ec073428 748 spin_unlock(&owner->so_lock);
1da177e4
LT		 749 if (new)
750 nfs4_free_open_state(new);
751 }
752out:
753 return state;
754}
755
1da177e4
LT		 756void nfs4_put_open_state(struct nfs4_state *state)
757{
758 struct inode *inode = state->inode;
759 struct nfs4_state_owner *owner = state->owner;
760
ace9fad4 761 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
1da177e4 762 return;
ec073428 763 spin_lock(&inode->i_lock);
9ae075fd 764 list_del_rcu(&state->inode_states);
1da177e4 765 list_del(&state->open_states);
ec073428
TM		 766 spin_unlock(&inode->i_lock);
767 spin_unlock(&owner->so_lock);
b7b7dac6 768 nfs4_inode_return_delegation_on_close(inode);
1da177e4 769 iput(inode);
1da177e4
LT		 770 nfs4_free_open_state(state);
771 nfs4_put_state_owner(owner);
772}
773
774/*
83c9d41e 775 * Close the current file.
1da177e4 776 */
643168c2 777static void __nfs4_close(struct nfs4_state *state,
8535b2be 778 fmode_t fmode, gfp_t gfp_mask, int wait)
1da177e4 779{
1da177e4 780 struct nfs4_state_owner *owner = state->owner;
003707c7 781 int call_close = 0;
dc0b027d 782 fmode_t newstate;
1da177e4
LT		 783
784 atomic_inc(&owner->so_count);
1da177e4 785 /* Protect against nfs4_find_state() */
ec073428 786 spin_lock(&owner->so_lock);
dc0b027d 787 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
e7616923
TM		 788 case FMODE_READ:
789 state->n_rdonly--;
790 break;
791 case FMODE_WRITE:
792 state->n_wronly--;
793 break;
794 case FMODE_READ|FMODE_WRITE:
795 state->n_rdwr--;
796 }
003707c7 797 newstate = FMODE_READ|FMODE_WRITE;
e7616923 798 if (state->n_rdwr == 0) {
003707c7 799 if (state->n_rdonly == 0) {
e7616923 800 newstate &= ~FMODE_READ;
003707c7
TM		 801 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
802 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
803 }
804 if (state->n_wronly == 0) {
e7616923 805 newstate &= ~FMODE_WRITE;
003707c7
TM		 806 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
807 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
808 }
809 if (newstate == 0)
810 clear_bit(NFS_DELEGATED_STATE, &state->flags);
e7616923 811 }
003707c7 812 nfs4_state_set_mode_locked(state, newstate);
ec073428 813 spin_unlock(&owner->so_lock);
4cecb76f 814
003707c7 815 if (!call_close) {
b39e625b
TM		 816 nfs4_put_open_state(state);
817 nfs4_put_state_owner(owner);
1f7977c1
TM		 818 } else
819 nfs4_do_close(state, gfp_mask, wait);
a49c3c77
TM		 820}
821
643168c2 822void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
a49c3c77 823{
da48f267 824 __nfs4_close(state, fmode, GFP_KERNEL, 0);
a49c3c77
TM		 825}
826
643168c2 827void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
a49c3c77 828{
643168c2 829 __nfs4_close(state, fmode, GFP_KERNEL, 1);
1da177e4
LT		 830}
831
832/*
833 * Search the state->lock_states for an existing lock_owner
3f8f2548
N		 834 * that is compatible with either of the given owners.
835 * If the second is non-zero, then the first refers to a Posix-lock
836 * owner (current->files) and the second refers to a flock/OFD
837 * owner (struct file*). In that case, prefer a match for the first
838 * owner.
839 * If both sorts of locks are held on the one file we cannot know
840 * which stateid was intended to be used, so a "correct" choice cannot
841 * be made. Failing that, a "consistent" choice is preferable. The
842 * consistent choice we make is to prefer the first owner, that of a
843 * Posix lock.
1da177e4
LT		 844 */
845static struct nfs4_lock_state *
8d424431
N		 846__nfs4_find_lock_state(struct nfs4_state *state,
847 fl_owner_t fl_owner, fl_owner_t fl_owner2)
1da177e4 848{
3f8f2548 849 struct nfs4_lock_state *pos, *ret = NULL;
1da177e4 850 list_for_each_entry(pos, &state->lock_states, ls_locks) {
3f8f2548
N		 851 if (pos->ls_owner == fl_owner) {
852 ret = pos;
853 break;
854 }
855 if (pos->ls_owner == fl_owner2)
856 ret = pos;
1da177e4 857 }
3f8f2548 858 if (ret)
194bc1f4 859 refcount_inc(&ret->ls_count);
3f8f2548 860 return ret;
1da177e4
LT		 861}
862
1da177e4
LT		 863/*
864 * Return a compatible lock_state. If no initialized lock_state structure
865 * exists, return an uninitialized one.
866 *
1da177e4 867 */
8003d3c4 868static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
1da177e4
LT		 869{
870 struct nfs4_lock_state *lsp;
24d292b8 871 struct nfs_server *server = state->owner->so_server;
1da177e4 872
9c00fd9a 873 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL_ACCOUNT);
1da177e4
LT		 874 if (lsp == NULL)
875 return NULL;
7ba127ab 876 nfs4_init_seqid_counter(&lsp->ls_seqid);
194bc1f4 877 refcount_set(&lsp->ls_count, 1);
b64aec8d 878 lsp->ls_state = state;
8003d3c4 879 lsp->ls_owner = fl_owner;
9c00fd9a
TM		 880 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id,
881 0, 0, GFP_KERNEL_ACCOUNT);
48c22eb2 882 if (lsp->ls_seqid.owner_id < 0)
d2d7ce28 883 goto out_free;
8d0a8a9d 884 INIT_LIST_HEAD(&lsp->ls_locks);
1da177e4 885 return lsp;
d2d7ce28
TM		 886out_free:
887 kfree(lsp);
888 return NULL;
1da177e4
LT		 889}
890
5ae67c4f 891void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9f958ab8 892{
48c22eb2 893 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
7ba127ab 894 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
9f958ab8
TM		 895 kfree(lsp);
896}
897
1da177e4
LT		 898/*
899 * Return a compatible lock_state. If no initialized lock_state structure
900 * exists, return an uninitialized one.
901 *
1da177e4 902 */
8003d3c4 903static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
1da177e4 904{
8d0a8a9d 905 struct nfs4_lock_state *lsp, *new = NULL;
1da177e4 906
8d0a8a9d
TM		 907 for(;;) {
908 spin_lock(&state->state_lock);
68e33bd6 909 lsp = __nfs4_find_lock_state(state, owner, NULL);
8d0a8a9d
TM		 910 if (lsp != NULL)
911 break;
912 if (new != NULL) {
8d0a8a9d
TM		 913 list_add(&new->ls_locks, &state->lock_states);
914 set_bit(LK_STATE_IN_USE, &state->flags);
915 lsp = new;
916 new = NULL;
917 break;
918 }
919 spin_unlock(&state->state_lock);
8003d3c4 920 new = nfs4_alloc_lock_state(state, owner);
8d0a8a9d
TM		 921 if (new == NULL)
922 return NULL;
923 }
924 spin_unlock(&state->state_lock);
9f958ab8 925 if (new != NULL)
5ae67c4f 926 nfs4_free_lock_state(state->owner->so_server, new);
1da177e4
LT		 927 return lsp;
928}
929
930/*
8d0a8a9d
TM		 931 * Release reference to lock_state, and free it if we see that
932 * it is no longer in use
1da177e4 933 */
faf5f49c 934void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
1da177e4 935{
c8b2d0bf 936 struct nfs_server *server;
8d0a8a9d 937 struct nfs4_state *state;
1da177e4 938
8d0a8a9d
TM		 939 if (lsp == NULL)
940 return;
941 state = lsp->ls_state;
194bc1f4 942 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
8d0a8a9d
TM		 943 return;
944 list_del(&lsp->ls_locks);
945 if (list_empty(&state->lock_states))
946 clear_bit(LK_STATE_IN_USE, &state->flags);
947 spin_unlock(&state->state_lock);
0c0e0d3c
JL		 948 server = state->owner->so_server;
949 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
950 struct nfs_client *clp = server->nfs_client;
951
952 clp->cl_mvops->free_lock_state(server, lsp);
953 } else
c8b2d0bf 954 nfs4_free_lock_state(server, lsp);
1da177e4
LT		 955}
956
8d0a8a9d 957static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
1da177e4 958{
8d0a8a9d 959 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
1da177e4 960
8d0a8a9d 961 dst->fl_u.nfs4_fl.owner = lsp;
194bc1f4 962 refcount_inc(&lsp->ls_count);
8d0a8a9d 963}
1da177e4 964
8d0a8a9d 965static void nfs4_fl_release_lock(struct file_lock *fl)
1da177e4 966{
8d0a8a9d 967 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
1da177e4
LT		 968}
969
6aed6285 970static const struct file_lock_operations nfs4_fl_lock_ops = {
8d0a8a9d
TM		 971 .fl_copy_lock = nfs4_fl_copy_lock,
972 .fl_release_private = nfs4_fl_release_lock,
973};
974
975int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
1da177e4 976{
8d0a8a9d
TM		 977 struct nfs4_lock_state *lsp;
978
979 if (fl->fl_ops != NULL)
980 return 0;
8003d3c4 981 lsp = nfs4_get_lock_state(state, fl->fl_owner);
8d0a8a9d
TM		 982 if (lsp == NULL)
983 return -ENOMEM;
984 fl->fl_u.nfs4_fl.owner = lsp;
985 fl->fl_ops = &nfs4_fl_lock_ops;
986 return 0;
1da177e4
LT		 987}
988
5521abfd
TM		 989static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
990 struct nfs4_state *state,
17393475 991 const struct nfs_lock_context *l_ctx)
1da177e4 992{
8d0a8a9d 993 struct nfs4_lock_state *lsp;
8d424431 994 fl_owner_t fl_owner, fl_flock_owner;
5521abfd 995 int ret = -ENOENT;
1da177e4 996
17393475 997 if (l_ctx == NULL)
2a369153
TM		 998 goto out;
999
8d0a8a9d 1000 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
4fc8796d 1001 goto out;
1da177e4 1002
d51fdb87 1003 fl_owner = l_ctx->lockowner;
8d424431
N		 1004 fl_flock_owner = l_ctx->open_context->flock_owner;
1005
8d0a8a9d 1006 spin_lock(&state->state_lock);
8d424431 1007 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
ef1820f9
N		 1008 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
1009 ret = -EIO;
1010 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
f597c537 1011 nfs4_stateid_copy(dst, &lsp->ls_stateid);
5521abfd 1012 ret = 0;
4fc8796d 1013 }
8d0a8a9d 1014 spin_unlock(&state->state_lock);
1da177e4 1015 nfs4_put_lock_state(lsp);
4fc8796d
TM		 1016out:
1017 return ret;
1018}
1019
c82bac6f 1020bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
4fc8796d 1021{
c82bac6f 1022 bool ret;
92b40e93 1023 const nfs4_stateid *src;
4fc8796d
TM		 1024 int seq;
1025
1026 do {
c82bac6f 1027 ret = false;
92b40e93 1028 src = &zero_stateid;
4fc8796d 1029 seq = read_seqbegin(&state->seqlock);
c82bac6f 1030 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
92b40e93 1031 src = &state->open_stateid;
c82bac6f
TM		 1032 ret = true;
1033 }
92b40e93 1034 nfs4_stateid_copy(dst, src);
4fc8796d 1035 } while (read_seqretry(&state->seqlock, seq));
c82bac6f 1036 return ret;
4fc8796d
TM		 1037}
1038
1039/*
1040 * Byte-range lock aware utility to initialize the stateid of read/write
1041 * requests.
1042 */
abf4e13c 1043int nfs4_select_rw_stateid(struct nfs4_state *state,
17393475 1044 fmode_t fmode, const struct nfs_lock_context *l_ctx,
a52458b4 1045 nfs4_stateid *dst, const struct cred **cred)
4fc8796d 1046{
abf4e13c
TM		 1047 int ret;
1048
7ebeb7fe
TM		 1049 if (!nfs4_valid_open_stateid(state))
1050 return -EIO;
abf4e13c
TM		 1051 if (cred != NULL)
1052 *cred = NULL;
17393475 1053 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
ef1820f9
N		 1054 if (ret == -EIO)
1055 /* A lost lock - don't even consider delegations */
1056 goto out;
146d70ca 1057 /* returns true if delegation stateid found and copied */
abf4e13c 1058 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
146d70ca 1059 ret = 0;
5521abfd 1060 goto out;
146d70ca 1061 }
5521abfd 1062 if (ret != -ENOENT)
ef1820f9
N		 1063 /* nfs4_copy_delegation_stateid() didn't over-write
1064 * dst, so it still has the lock stateid which we now
1065 * choose to use.
1066 */
5521abfd 1067 goto out;
d9aba2b4 1068 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
5521abfd 1069out:
3b66486c
TM		 1070 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1071 dst->seqid = 0;
5521abfd 1072 return ret;
1da177e4
LT		 1073}
1074
8535b2be 1075struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
cee54fc9 1076{
cee54fc9
TM		 1077 struct nfs_seqid *new;
1078
8535b2be 1079 new = kmalloc(sizeof(*new), gfp_mask);
badc76dd
TM		 1080 if (new == NULL)
1081 return ERR_PTR(-ENOMEM);
1082 new->sequence = counter;
1083 INIT_LIST_HEAD(&new->list);
1084 new->task = NULL;
cee54fc9
TM		 1085 return new;
1086}
1087
72211dbe 1088void nfs_release_seqid(struct nfs_seqid *seqid)
1da177e4 1089{
4601df20 1090 struct nfs_seqid_counter *sequence;
cee54fc9 1091
a6796419 1092 if (seqid == NULL || list_empty(&seqid->list))
4601df20
TM		 1093 return;
1094 sequence = seqid->sequence;
1095 spin_lock(&sequence->lock);
1096 list_del_init(&seqid->list);
1097 if (!list_empty(&sequence->list)) {
1098 struct nfs_seqid *next;
1099
1100 next = list_first_entry(&sequence->list,
1101 struct nfs_seqid, list);
1102 rpc_wake_up_queued_task(&sequence->wait, next->task);
2f74c0a0 1103 }
4601df20 1104 spin_unlock(&sequence->lock);
72211dbe
TM		 1105}
1106
1107void nfs_free_seqid(struct nfs_seqid *seqid)
1108{
1109 nfs_release_seqid(seqid);
cee54fc9 1110 kfree(seqid);
1da177e4
LT		 1111}
1112
1113/*
cee54fc9
TM		 1114 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1115 * failed with a seqid incrementing error -
16a6ddc7 1116 * see comments nfs4.h:seqid_mutating_error()
cee54fc9 1117 */
88d90939 1118static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
cee54fc9
TM		 1119{
1120 switch (status) {
1121 case 0:
1122 break;
1123 case -NFS4ERR_BAD_SEQID:
6f43ddcc
TM		 1124 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1125 return;
9a3ba432 1126 pr_warn_ratelimited("NFS: v4 server returned a bad"
497799e7
DM		 1127 " sequence-id error on an"
1128 " unconfirmed sequence %p!\n",
6f43ddcc 1129 seqid->sequence);
ffb81717 1130 return;
cee54fc9
TM		 1131 case -NFS4ERR_STALE_CLIENTID:
1132 case -NFS4ERR_STALE_STATEID:
1133 case -NFS4ERR_BAD_STATEID:
1134 case -NFS4ERR_BADXDR:
1135 case -NFS4ERR_RESOURCE:
1136 case -NFS4ERR_NOFILEHANDLE:
406dab84 1137 case -NFS4ERR_MOVED:
cee54fc9
TM		 1138 /* Non-seqid mutating errors */
1139 return;
8b98a532 1140 }
cee54fc9
TM		 1141 /*
1142 * Note: no locking needed as we are guaranteed to be first
1143 * on the sequence list
1144 */
1145 seqid->sequence->counter++;
1146}
1147
1148void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1149{
a6796419
TM		 1150 struct nfs4_state_owner *sp;
1151
1152 if (seqid == NULL)
1153 return;
34dc1ad7 1154
a6796419 1155 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
34dc1ad7 1156 if (status == -NFS4ERR_BAD_SEQID)
86cfb041 1157 nfs4_reset_state_owner(sp);
a6796419 1158 if (!nfs4_has_session(sp->so_server->nfs_client))
34dc1ad7 1159 nfs_increment_seqid(status, seqid);
cee54fc9
TM		 1160}
1161
1162/*
cee54fc9
TM		 1163 * Increment the seqid if the LOCK/LOCKU succeeded, or
1164 * failed with a seqid incrementing error -
16a6ddc7 1165 * see comments nfs4.h:seqid_mutating_error()
cee54fc9
TM		 1166 */
1167void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1168{
a6796419
TM		 1169 if (seqid != NULL)
1170 nfs_increment_seqid(status, seqid);
cee54fc9
TM		 1171}
1172
1173int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1174{
a6796419 1175 struct nfs_seqid_counter *sequence;
cee54fc9
TM		 1176 int status = 0;
1177
a6796419
TM		 1178 if (seqid == NULL)
1179 goto out;
1180 sequence = seqid->sequence;
cee54fc9 1181 spin_lock(&sequence->lock);
4601df20 1182 seqid->task = task;
2f74c0a0
TM		 1183 if (list_empty(&seqid->list))
1184 list_add_tail(&seqid->list, &sequence->list);
1185 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1186 goto unlock;
5d00837b 1187 rpc_sleep_on(&sequence->wait, task, NULL);
2f74c0a0
TM		 1188 status = -EAGAIN;
1189unlock:
cee54fc9 1190 spin_unlock(&sequence->lock);
a6796419 1191out:
cee54fc9 1192 return status;
1da177e4
LT		 1193}
1194
e005e804 1195static int nfs4_run_state_manager(void *);
1da177e4 1196
e005e804 1197static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
433fbe4c 1198{
43d20e80 1199 clear_and_wake_up_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
433fbe4c
TM		 1200 rpc_wake_up(&clp->cl_rpcwaitq);
1201}
1202
1da177e4 1203/*
e005e804 1204 * Schedule the nfs_client asynchronous state management routine
1da177e4 1205 */
b0d3ded1 1206void nfs4_schedule_state_manager(struct nfs_client *clp)
1da177e4 1207{
5043e900 1208 struct task_struct *task;
2446ab60 1209 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
4dc73c67
N		 1210 struct rpc_clnt *cl = clp->cl_rpcclient;
1211
1212 while (cl != cl->cl_parent)
1213 cl = cl->cl_parent;
1da177e4 1214
aeabb3c9 1215 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
4dc73c67
N		 1216 if (test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state) != 0) {
1217 wake_up_var(&clp->cl_state);
e005e804 1218 return;
4dc73c67
N		 1219 }
1220 set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
5043e900 1221 __module_get(THIS_MODULE);
212bf41d 1222 refcount_inc(&clp->cl_count);
2446ab60
TM		 1223
1224 /* The rcu_read_lock() is not strictly necessary, as the state
1225 * manager is the only thread that ever changes the rpc_xprt
1226 * after it's initialized. At this point, we're single threaded. */
1227 rcu_read_lock();
1228 snprintf(buf, sizeof(buf), "%s-manager",
1229 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1230 rcu_read_unlock();
f170168b 1231 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
2446ab60
TM		 1232 if (IS_ERR(task)) {
1233 printk(KERN_ERR "%s: kthread_run: %ld\n",
1234 __func__, PTR_ERR(task));
1235 nfs4_clear_state_manager_bit(clp);
4dc73c67 1236 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2446ab60
TM		 1237 nfs_put_client(clp);
1238 module_put(THIS_MODULE);
1239 }
1da177e4
LT		 1240}
1241
1242/*
0400a6b0 1243 * Schedule a lease recovery attempt
1da177e4 1244 */
0400a6b0 1245void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1da177e4
LT		 1246{
1247 if (!clp)
1248 return;
e598d843
TM		 1249 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1250 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
cc0a9843
TM		 1251 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1252 clp->cl_hostname);
e005e804 1253 nfs4_schedule_state_manager(clp);
1da177e4 1254}
9cb81968 1255EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1da177e4 1256
c9fdeb28
CL		 1257/**
1258 * nfs4_schedule_migration_recovery - trigger migration recovery
1259 *
1260 * @server: FSID that is migrating
1261 *
1262 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1263 * value is returned.
1264 */
1265int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1266{
1267 struct nfs_client *clp = server->nfs_client;
1268
1269 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1270 pr_err("NFS: volatile file handles not supported (server %s)\n",
1271 clp->cl_hostname);
1272 return -NFS4ERR_IO;
1273 }
1274
1275 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1276 return -NFS4ERR_IO;
1277
1278 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1279 __func__,
1280 (unsigned long long)server->fsid.major,
1281 (unsigned long long)server->fsid.minor,
1282 clp->cl_hostname);
1283
1284 set_bit(NFS_MIG_IN_TRANSITION,
1285 &((struct nfs_server *)server)->mig_status);
1286 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1287
1288 nfs4_schedule_state_manager(clp);
1289 return 0;
1290}
1291EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1292
b7f7a66e
CL		 1293/**
1294 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1295 *
1296 * @clp: server to check for moved leases
1297 *
1298 */
1299void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1300{
1301 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1302 __func__, clp->cl_clientid, clp->cl_hostname);
1303
1304 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1305 nfs4_schedule_state_manager(clp);
1306}
1307EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1308
33021279
TM		 1309int nfs4_wait_clnt_recover(struct nfs_client *clp)
1310{
1311 int res;
1312
1313 might_sleep();
1314
212bf41d 1315 refcount_inc(&clp->cl_count);
74316201
N		 1316 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1317 nfs_wait_bit_killable, TASK_KILLABLE);
33021279 1318 if (res)
0625c2dd 1319 goto out;
33021279 1320 if (clp->cl_cons_state < 0)
0625c2dd
CL		 1321 res = clp->cl_cons_state;
1322out:
1323 nfs_put_client(clp);
1324 return res;
33021279
TM		 1325}
1326
1327int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1328{
1329 unsigned int loop;
1330 int ret;
1331
1332 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1333 ret = nfs4_wait_clnt_recover(clp);
1334 if (ret != 0)
1335 break;
1336 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1337 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1338 break;
1339 nfs4_schedule_state_manager(clp);
1340 ret = -EIO;
1341 }
1342 return ret;
1343}
1344
ad1e3968
TM		 1345/*
1346 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1347 * @clp: client to process
1348 *
1349 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1350 * resend of the SETCLIENTID and hence re-establish the
1351 * callback channel. Then return all existing delegations.
1352 */
1353static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1354{
1355 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1356 nfs_expire_all_delegations(clp);
cc0a9843
TM		 1357 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1358 clp->cl_hostname);
ad1e3968
TM		 1359}
1360
042b60be
TM		 1361void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1362{
ad1e3968 1363 nfs40_handle_cb_pathdown(clp);
042b60be
TM		 1364 nfs4_schedule_state_manager(clp);
1365}
1366
f9feab1e 1367static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
b79a4a1b
TM		 1368{
1369
7ebeb7fe
TM		 1370 if (!nfs4_valid_open_stateid(state))
1371 return 0;
b79a4a1b
TM		 1372 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1373 /* Don't recover state that expired before the reboot */
1374 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1375 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1376 return 0;
1377 }
7eff03ae 1378 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
b79a4a1b
TM		 1379 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1380 return 1;
1381}
1382
4f14c194 1383int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
b79a4a1b 1384{
7ebeb7fe
TM		 1385 if (!nfs4_valid_open_stateid(state))
1386 return 0;
b79a4a1b
TM		 1387 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1388 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
7eff03ae 1389 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
b79a4a1b
TM		 1390 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1391 return 1;
1392}
1393
5d422301 1394int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
0400a6b0
TM		 1395{
1396 struct nfs_client *clp = server->nfs_client;
1397
7ebeb7fe 1398 if (!nfs4_state_mark_reclaim_nograce(clp, state))
5d422301 1399 return -EBADF;
994b15b9
TM		 1400 nfs_inode_find_delegation_state_and_recover(state->inode,
1401 &state->stateid);
cc0a9843
TM		 1402 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1403 clp->cl_hostname);
0400a6b0 1404 nfs4_schedule_state_manager(clp);
5d422301 1405 return 0;
0400a6b0 1406}
9cb81968 1407EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
0400a6b0 1408
6c2d8f8d
TM		 1409static struct nfs4_lock_state *
1410nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1411 const nfs4_stateid *stateid)
1412{
1413 struct nfs4_lock_state *pos;
1414
1415 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1416 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1417 continue;
42c304c3 1418 if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid))
6c2d8f8d
TM		 1419 return pos;
1420 }
1421 return NULL;
1422}
1423
1424static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1425 const nfs4_stateid *stateid)
1426{
1427 bool found = false;
1428
1429 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1430 spin_lock(&state->state_lock);
1431 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1432 found = true;
1433 spin_unlock(&state->state_lock);
1434 }
1435 return found;
1436}
1437
a1d0b5ee
TM		 1438void nfs_inode_find_state_and_recover(struct inode *inode,
1439 const nfs4_stateid *stateid)
1440{
1441 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1442 struct nfs_inode *nfsi = NFS_I(inode);
1443 struct nfs_open_context *ctx;
1444 struct nfs4_state *state;
1445 bool found = false;
1446
0de43976
TM		 1447 rcu_read_lock();
1448 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
a1d0b5ee
TM		 1449 state = ctx->state;
1450 if (state == NULL)
1451 continue;
42c304c3 1452 if (nfs4_stateid_match_or_older(&state->stateid, stateid) &&
7ebeb7fe 1453 nfs4_state_mark_reclaim_nograce(clp, state)) {
6c2d8f8d 1454 found = true;
a1d0b5ee 1455 continue;
6c2d8f8d 1456 }
42c304c3
TM		 1457 if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1458 nfs4_stateid_match_or_older(&state->open_stateid, stateid) &&
46280d9d
TM		 1459 nfs4_state_mark_reclaim_nograce(clp, state)) {
1460 found = true;
1461 continue;
1462 }
7ebeb7fe
TM		 1463 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1464 nfs4_state_mark_reclaim_nograce(clp, state))
6c2d8f8d 1465 found = true;
a1d0b5ee 1466 }
0de43976 1467 rcu_read_unlock();
6c2d8f8d
TM		 1468
1469 nfs_inode_find_delegation_state_and_recover(inode, stateid);
a1d0b5ee
TM		 1470 if (found)
1471 nfs4_schedule_state_manager(clp);
1472}
1473
86dbd08b 1474static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
c58c8441
TM		 1475{
1476 struct inode *inode = state->inode;
1477 struct nfs_inode *nfsi = NFS_I(inode);
1478 struct nfs_open_context *ctx;
1479
0de43976
TM		 1480 rcu_read_lock();
1481 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
c58c8441
TM		 1482 if (ctx->state != state)
1483 continue;
1484 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
86dbd08b
TM		 1485 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1486 "error = %d\n", ctx->dentry, err);
c58c8441 1487 }
0de43976 1488 rcu_read_unlock();
c58c8441
TM		 1489}
1490
5d422301
TM		 1491static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1492{
1493 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
86dbd08b 1494 nfs4_state_mark_open_context_bad(state, error);
5d422301
TM		 1495}
1496
a1d0b5ee 1497
02860014 1498static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1da177e4
LT		 1499{
1500 struct inode *inode = state->inode;
19e03c57 1501 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1502 struct file_lock *fl;
dce2630c 1503 struct nfs4_lock_state *lsp;
1da177e4 1504 int status = 0;
5263e31e 1505 struct file_lock_context *flctx = inode->i_flctx;
bd61e0a9 1506 struct list_head *list;
1da177e4 1507
bd61e0a9 1508 if (flctx == NULL)
3f09df70
TM		 1509 return 0;
1510
bd61e0a9
JL		 1511 list = &flctx->flc_posix;
1512
3f09df70 1513 /* Guard against delegation returns and new lock/unlock calls */
19e03c57 1514 down_write(&nfsi->rwsem);
6109c850 1515 spin_lock(&flctx->flc_lock);
bd61e0a9
JL		 1516restart:
1517 list_for_each_entry(fl, list, fl_list) {
5263e31e
JL		 1518 if (nfs_file_open_context(fl->fl_file)->state != state)
1519 continue;
6109c850 1520 spin_unlock(&flctx->flc_lock);
5263e31e
JL		 1521 status = ops->recover_lock(state, fl);
1522 switch (status) {
1523 case 0:
1524 break;
67e7b52d 1525 case -ETIMEDOUT:
5263e31e
JL		 1526 case -ESTALE:
1527 case -NFS4ERR_ADMIN_REVOKED:
1528 case -NFS4ERR_STALE_STATEID:
1529 case -NFS4ERR_BAD_STATEID:
1530 case -NFS4ERR_EXPIRED:
1531 case -NFS4ERR_NO_GRACE:
1532 case -NFS4ERR_STALE_CLIENTID:
1533 case -NFS4ERR_BADSESSION:
1534 case -NFS4ERR_BADSLOT:
1535 case -NFS4ERR_BAD_HIGH_SLOT:
1536 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1537 goto out;
1538 default:
1539 pr_err("NFS: %s: unhandled error %d\n",
1540 __func__, status);
df561f66 1541 fallthrough;
5263e31e
JL		 1542 case -ENOMEM:
1543 case -NFS4ERR_DENIED:
1544 case -NFS4ERR_RECLAIM_BAD:
1545 case -NFS4ERR_RECLAIM_CONFLICT:
dce2630c
N		 1546 lsp = fl->fl_u.nfs4_fl.owner;
1547 if (lsp)
1548 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
5263e31e
JL		 1549 status = 0;
1550 }
6109c850 1551 spin_lock(&flctx->flc_lock);
5263e31e 1552 }
bd61e0a9
JL		 1553 if (list == &flctx->flc_posix) {
1554 list = &flctx->flc_flock;
1555 goto restart;
1556 }
6109c850 1557 spin_unlock(&flctx->flc_lock);
965b5d67 1558out:
19e03c57 1559 up_write(&nfsi->rwsem);
1da177e4
LT		 1560 return status;
1561}
1562
80f42368
AS		 1563#ifdef CONFIG_NFS_V4_2
1564static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1565{
1566 struct nfs4_copy_state *copy;
1567
0e65a32c
OK		 1568 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1569 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags))
80f42368
AS		 1570 return;
1571
1572 spin_lock(&sp->so_server->nfs_client->cl_lock);
1573 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
0e65a32c
OK		 1574 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) &&
1575 !nfs4_stateid_match_other(&state->stateid,
1576 &copy->parent_dst_state->stateid)))
1577 continue;
80f42368 1578 copy->flags = 1;
0e65a32c
OK		 1579 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1580 &state->flags)) {
1581 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags);
1582 complete(&copy->completion);
1583 }
1584 }
1585 list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) {
1586 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) &&
1587 !nfs4_stateid_match_other(&state->stateid,
1588 &copy->parent_src_state->stateid)))
1589 continue;
1590 copy->flags = 1;
1591 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE,
1592 &state->flags))
1593 complete(&copy->completion);
80f42368
AS		 1594 }
1595 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1596}
1597#else /* !CONFIG_NFS_V4_2 */
1598static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1599 struct nfs4_state *state)
1600{
1601}
1602#endif /* CONFIG_NFS_V4_2 */
1603
cb7a8384
AS		 1604static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1605 const struct nfs4_state_recovery_ops *ops)
1606{
1607 struct nfs4_lock_state *lock;
1608 int status;
1609
1610 status = ops->recover_open(sp, state);
1611 if (status < 0)
1612 return status;
1613
1614 status = nfs4_reclaim_locks(state, ops);
1615 if (status < 0)
1616 return status;
1617
1618 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1619 spin_lock(&state->state_lock);
1620 list_for_each_entry(lock, &state->lock_states, ls_locks) {
21f86d2d 1621 trace_nfs4_state_lock_reclaim(state, lock);
cb7a8384
AS		 1622 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1623 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1624 }
1625 spin_unlock(&state->state_lock);
1626 }
1627
80f42368 1628 nfs42_complete_copies(sp, state);
cb7a8384
AS		 1629 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1630 return status;
1631}
1632
02860014 1633static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1da177e4
LT		 1634{
1635 struct nfs4_state *state;
c34fae00 1636 unsigned int loop = 0;
1da177e4 1637 int status = 0;
0b9018b9
OK		 1638#ifdef CONFIG_NFS_V4_2
1639 bool found_ssc_copy_state = false;
1640#endif /* CONFIG_NFS_V4_2 */
1da177e4
LT		 1641
1642 /* Note: we rely on the sp->so_states list being ordered
1643 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1644 * states first.
1645 * This is needed to ensure that the server won't give us any
1646 * read delegations that we have to return if, say, we are
1647 * recovering after a network partition or a reboot from a
1648 * server that doesn't support a grace period.
1649 */
fe1d8195 1650 spin_lock(&sp->so_lock);
abbec2da 1651 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
c137afab 1652restart:
1da177e4 1653 list_for_each_entry(state, &sp->so_states, open_states) {
b79a4a1b
TM		 1654 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1655 continue;
5d422301
TM		 1656 if (!nfs4_valid_open_stateid(state))
1657 continue;
1da177e4
LT		 1658 if (state->state == 0)
1659 continue;
0b9018b9
OK		 1660#ifdef CONFIG_NFS_V4_2
1661 if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) {
1662 nfs4_state_mark_recovery_failed(state, -EIO);
1663 found_ssc_copy_state = true;
1664 continue;
1665 }
1666#endif /* CONFIG_NFS_V4_2 */
ace9fad4 1667 refcount_inc(&state->count);
fe1d8195 1668 spin_unlock(&sp->so_lock);
cb7a8384 1669 status = __nfs4_reclaim_open_state(sp, state, ops);
cb7a8384 1670
1da177e4 1671 switch (status) {
35a61606 1672 default:
c34fae00
TM		 1673 if (status >= 0) {
1674 loop = 0;
b79a4a1b 1675 break;
c34fae00 1676 }
35a61606 1677 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
df561f66 1678 fallthrough;
35a61606
AS		 1679 case -ENOENT:
1680 case -ENOMEM:
1681 case -EACCES:
1682 case -EROFS:
1683 case -EIO:
1684 case -ESTALE:
1685 /* Open state on this file cannot be recovered */
1686 nfs4_state_mark_recovery_failed(state, status);
1687 break;
1688 case -EAGAIN:
1689 ssleep(1);
c34fae00
TM		 1690 if (loop++ < 10) {
1691 set_bit(ops->state_flag_bit, &state->flags);
1692 break;
1693 }
df561f66 1694 fallthrough;
35a61606
AS		 1695 case -NFS4ERR_ADMIN_REVOKED:
1696 case -NFS4ERR_STALE_STATEID:
1697 case -NFS4ERR_OLD_STATEID:
1698 case -NFS4ERR_BAD_STATEID:
1699 case -NFS4ERR_RECLAIM_BAD:
1700 case -NFS4ERR_RECLAIM_CONFLICT:
1701 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1702 break;
1703 case -NFS4ERR_EXPIRED:
1704 case -NFS4ERR_NO_GRACE:
1705 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
df561f66 1706 fallthrough;
35a61606
AS		 1707 case -NFS4ERR_STALE_CLIENTID:
1708 case -NFS4ERR_BADSESSION:
1709 case -NFS4ERR_BADSLOT:
1710 case -NFS4ERR_BAD_HIGH_SLOT:
1711 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
67e7b52d 1712 case -ETIMEDOUT:
35a61606 1713 goto out_err;
1da177e4 1714 }
fe1d8195 1715 nfs4_put_open_state(state);
c137afab 1716 spin_lock(&sp->so_lock);
fe1d8195 1717 goto restart;
1da177e4 1718 }
abbec2da 1719 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
fe1d8195 1720 spin_unlock(&sp->so_lock);
0b9018b9
OK		 1721#ifdef CONFIG_NFS_V4_2
1722 if (found_ssc_copy_state)
1723 return -EIO;
1724#endif /* CONFIG_NFS_V4_2 */
1da177e4
LT		 1725 return 0;
1726out_err:
fe1d8195 1727 nfs4_put_open_state(state);
c137afab 1728 spin_lock(&sp->so_lock);
abbec2da 1729 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
c137afab 1730 spin_unlock(&sp->so_lock);
1da177e4
LT		 1731 return status;
1732}
1733
b79a4a1b
TM		 1734static void nfs4_clear_open_state(struct nfs4_state *state)
1735{
1736 struct nfs4_lock_state *lock;
1737
1738 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1739 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1740 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1741 clear_bit(NFS_O_RDWR_STATE, &state->flags);
4b44b40e 1742 spin_lock(&state->state_lock);
b79a4a1b 1743 list_for_each_entry(lock, &state->lock_states, ls_locks) {
b79a4a1b 1744 lock->ls_seqid.flags = 0;
795a88c9 1745 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
b79a4a1b 1746 }
4b44b40e 1747 spin_unlock(&state->state_lock);
b79a4a1b
TM		 1748}
1749
24d292b8
CL		 1750static void nfs4_reset_seqids(struct nfs_server *server,
1751 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
cee54fc9 1752{
24d292b8 1753 struct nfs_client *clp = server->nfs_client;
cee54fc9 1754 struct nfs4_state_owner *sp;
9f958ab8 1755 struct rb_node *pos;
cee54fc9 1756 struct nfs4_state *state;
cee54fc9 1757
24d292b8
CL		 1758 spin_lock(&clp->cl_lock);
1759 for (pos = rb_first(&server->state_owners);
1760 pos != NULL;
1761 pos = rb_next(pos)) {
1762 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
cee54fc9 1763 sp->so_seqid.flags = 0;
ec073428 1764 spin_lock(&sp->so_lock);
cee54fc9 1765 list_for_each_entry(state, &sp->so_states, open_states) {
b79a4a1b
TM		 1766 if (mark_reclaim(clp, state))
1767 nfs4_clear_open_state(state);
cee54fc9 1768 }
ec073428 1769 spin_unlock(&sp->so_lock);
cee54fc9 1770 }
24d292b8
CL		 1771 spin_unlock(&clp->cl_lock);
1772}
1773
1774static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1775 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1776{
1777 struct nfs_server *server;
1778
1779 rcu_read_lock();
1780 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1781 nfs4_reset_seqids(server, mark_reclaim);
1782 rcu_read_unlock();
cee54fc9
TM		 1783}
1784
b79a4a1b
TM		 1785static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1786{
1787 /* Mark all delegations for reclaim */
1788 nfs_delegation_mark_reclaim(clp);
1789 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1790}
1791
0048fdd0 1792static int nfs4_reclaim_complete(struct nfs_client *clp,
965e9c23 1793 const struct nfs4_state_recovery_ops *ops,
a52458b4 1794 const struct cred *cred)
fce5c838
RL		 1795{
1796 /* Notify the server we're done reclaiming our state */
1797 if (ops->reclaim_complete)
0048fdd0
TM		 1798 return ops->reclaim_complete(clp, cred);
1799 return 0;
fce5c838
RL		 1800}
1801
24d292b8 1802static void nfs4_clear_reclaim_server(struct nfs_server *server)
b79a4a1b 1803{
24d292b8 1804 struct nfs_client *clp = server->nfs_client;
b79a4a1b
TM		 1805 struct nfs4_state_owner *sp;
1806 struct rb_node *pos;
1807 struct nfs4_state *state;
1808
24d292b8
CL		 1809 spin_lock(&clp->cl_lock);
1810 for (pos = rb_first(&server->state_owners);
1811 pos != NULL;
1812 pos = rb_next(pos)) {
1813 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
b79a4a1b
TM		 1814 spin_lock(&sp->so_lock);
1815 list_for_each_entry(state, &sp->so_states, open_states) {
24d292b8
CL		 1816 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1817 &state->flags))
b79a4a1b
TM		 1818 continue;
1819 nfs4_state_mark_reclaim_nograce(clp, state);
1820 }
1821 spin_unlock(&sp->so_lock);
1822 }
24d292b8
CL		 1823 spin_unlock(&clp->cl_lock);
1824}
1825
1826static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1827{
1828 struct nfs_server *server;
1829
1830 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1831 return 0;
1832
1833 rcu_read_lock();
1834 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1835 nfs4_clear_reclaim_server(server);
1836 rcu_read_unlock();
b79a4a1b
TM		 1837
1838 nfs_delegation_reap_unclaimed(clp);
6eaa6149
TM		 1839 return 1;
1840}
1841
1842static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1843{
965e9c23 1844 const struct nfs4_state_recovery_ops *ops;
a52458b4 1845 const struct cred *cred;
0048fdd0 1846 int err;
965e9c23 1847
6eaa6149
TM		 1848 if (!nfs4_state_clear_reclaim_reboot(clp))
1849 return;
965e9c23 1850 ops = clp->cl_mvops->reboot_recovery_ops;
73d8bde5 1851 cred = nfs4_get_clid_cred(clp);
0048fdd0 1852 err = nfs4_reclaim_complete(clp, ops, cred);
a52458b4 1853 put_cred(cred);
0048fdd0
TM		 1854 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1855 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
b79a4a1b
TM		 1856}
1857
b79a4a1b
TM		 1858static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1859{
45870d69 1860 nfs_mark_test_expired_all_delegations(clp);
b79a4a1b
TM		 1861 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1862}
1863
4f7cdf18 1864static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
e598d843
TM		 1865{
1866 switch (error) {
000d3f95
AS		 1867 case 0:
1868 break;
1869 case -NFS4ERR_CB_PATH_DOWN:
1870 nfs40_handle_cb_pathdown(clp);
1871 break;
1872 case -NFS4ERR_NO_GRACE:
1873 nfs4_state_end_reclaim_reboot(clp);
1874 break;
1875 case -NFS4ERR_STALE_CLIENTID:
1876 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1877 nfs4_state_start_reclaim_reboot(clp);
1878 break;
1879 case -NFS4ERR_EXPIRED:
1880 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1881 nfs4_state_start_reclaim_nograce(clp);
1882 break;
1883 case -NFS4ERR_BADSESSION:
1884 case -NFS4ERR_BADSLOT:
1885 case -NFS4ERR_BAD_HIGH_SLOT:
1886 case -NFS4ERR_DEADSESSION:
1887 case -NFS4ERR_SEQ_FALSE_RETRY:
1888 case -NFS4ERR_SEQ_MISORDERED:
1889 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1890 /* Zero session reset errors */
1891 break;
1892 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1893 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1894 break;
1895 default:
1896 dprintk("%s: failed to handle error %d for server %s\n",
1897 __func__, error, clp->cl_hostname);
1898 return error;
e598d843 1899 }
cc0a9843
TM		 1900 dprintk("%s: handled error %d for server %s\n", __func__, error,
1901 clp->cl_hostname);
4f38e4aa 1902 return 0;
e598d843
TM		 1903}
1904
02860014 1905static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1da177e4 1906{
24d292b8
CL		 1907 struct nfs4_state_owner *sp;
1908 struct nfs_server *server;
9f958ab8 1909 struct rb_node *pos;
c77e2283 1910 LIST_HEAD(freeme);
1da177e4
LT		 1911 int status = 0;
1912
7eff03ae 1913restart:
24d292b8
CL		 1914 rcu_read_lock();
1915 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
c77e2283 1916 nfs4_purge_state_owners(server, &freeme);
24d292b8
CL		 1917 spin_lock(&clp->cl_lock);
1918 for (pos = rb_first(&server->state_owners);
1919 pos != NULL;
1920 pos = rb_next(pos)) {
1921 sp = rb_entry(pos,
1922 struct nfs4_state_owner, so_server_node);
1923 if (!test_and_clear_bit(ops->owner_flag_bit,
1924 &sp->so_flags))
1925 continue;
4a0954ef
TM		 1926 if (!atomic_inc_not_zero(&sp->so_count))
1927 continue;
24d292b8
CL		 1928 spin_unlock(&clp->cl_lock);
1929 rcu_read_unlock();
1930
1931 status = nfs4_reclaim_open_state(sp, ops);
1932 if (status < 0) {
1933 set_bit(ops->owner_flag_bit, &sp->so_flags);
1934 nfs4_put_state_owner(sp);
df817ba3
TM		 1935 status = nfs4_recovery_handle_error(clp, status);
1936 return (status != 0) ? status : -EAGAIN;
24d292b8
CL		 1937 }
1938
7eff03ae 1939 nfs4_put_state_owner(sp);
24d292b8 1940 goto restart;
7eff03ae 1941 }
24d292b8 1942 spin_unlock(&clp->cl_lock);
02860014 1943 }
24d292b8 1944 rcu_read_unlock();
c77e2283 1945 nfs4_free_state_owners(&freeme);
df817ba3 1946 return 0;
02860014
TM		 1947}
1948
1949static int nfs4_check_lease(struct nfs_client *clp)
1950{
a52458b4 1951 const struct cred *cred;
c48f4f35
TM		 1952 const struct nfs4_state_maintenance_ops *ops =
1953 clp->cl_mvops->state_renewal_ops;
4f38e4aa 1954 int status;
1da177e4 1955
0f605b56
TM		 1956 /* Is the client already known to have an expired lease? */
1957 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1958 return 0;
f15e1e8b 1959 cred = ops->get_state_renewal_cred(clp);
0f605b56 1960 if (cred == NULL) {
73d8bde5 1961 cred = nfs4_get_clid_cred(clp);
4f38e4aa 1962 status = -ENOKEY;
0f605b56
TM		 1963 if (cred == NULL)
1964 goto out;
286d7d6a 1965 }
8e69514f 1966 status = ops->renew_lease(clp, cred);
a52458b4 1967 put_cred(cred);
bc7a05ca
TM		 1968 if (status == -ETIMEDOUT) {
1969 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1970 return 0;
1971 }
0f605b56 1972out:
4f7cdf18 1973 return nfs4_recovery_handle_error(clp, status);
02860014
TM		 1974}
1975
47b803c8
AA		 1976/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1977 * and for recoverable errors on EXCHANGE_ID for v4.1
2a6ee6aa
TM		 1978 */
1979static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1980{
1981 switch (status) {
89a21736
TM		 1982 case -NFS4ERR_SEQ_MISORDERED:
1983 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1984 return -ESERVERFAULT;
1985 /* Lease confirmation error: retry after purging the lease */
1986 ssleep(1);
47b803c8
AA		 1987 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1988 break;
2a6ee6aa
TM		 1989 case -NFS4ERR_STALE_CLIENTID:
1990 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
47b803c8 1991 nfs4_state_start_reclaim_reboot(clp);
2a6ee6aa 1992 break;
de734831
CL		 1993 case -NFS4ERR_CLID_INUSE:
1994 pr_err("NFS: Server %s reports our clientid is in use\n",
1995 clp->cl_hostname);
1996 nfs_mark_client_ready(clp, -EPERM);
1997 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1998 return -EPERM;
2a6ee6aa 1999 case -EACCES:
2a6ee6aa 2000 case -NFS4ERR_DELAY:
2a6ee6aa
TM		 2001 case -EAGAIN:
2002 ssleep(1);
2003 break;
2004
2005 case -NFS4ERR_MINOR_VERS_MISMATCH:
2006 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2007 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
cc0a9843
TM		 2008 dprintk("%s: exit with error %d for server %s\n",
2009 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
2a6ee6aa 2010 return -EPROTONOSUPPORT;
ea027cb2
OK		 2011 case -ENOSPC:
2012 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
2013 nfs_mark_client_ready(clp, -EIO);
2014 return -EIO;
2a6ee6aa
TM		 2015 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2016 * in nfs4_exchange_id */
2017 default:
cc0a9843
TM		 2018 dprintk("%s: exit with error %d for server %s\n", __func__,
2019 status, clp->cl_hostname);
2a6ee6aa
TM		 2020 return status;
2021 }
2022 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
cc0a9843
TM		 2023 dprintk("%s: handled error %d for server %s\n", __func__, status,
2024 clp->cl_hostname);
2a6ee6aa
TM		 2025 return 0;
2026}
2027
b42353ff 2028static int nfs4_establish_lease(struct nfs_client *clp)
02860014 2029{
a52458b4 2030 const struct cred *cred;
c48f4f35
TM		 2031 const struct nfs4_state_recovery_ops *ops =
2032 clp->cl_mvops->reboot_recovery_ops;
2a6ee6aa 2033 int status;
02860014 2034
8aafd2fd
TM		 2035 status = nfs4_begin_drain_session(clp);
2036 if (status != 0)
2037 return status;
73d8bde5 2038 cred = nfs4_get_clid_cred(clp);
2a6ee6aa
TM		 2039 if (cred == NULL)
2040 return -ENOENT;
2041 status = ops->establish_clid(clp, cred);
a52458b4 2042 put_cred(cred);
2a6ee6aa 2043 if (status != 0)
b42353ff
TM		 2044 return status;
2045 pnfs_destroy_all_layouts(clp);
2046 return 0;
2047}
2048
6bbb4ae8
CL		 2049/*
2050 * Returns zero or a negative errno. NFS4ERR values are converted
2051 * to local errno values.
2052 */
b42353ff
TM		 2053static int nfs4_reclaim_lease(struct nfs_client *clp)
2054{
2055 int status;
2056
2057 status = nfs4_establish_lease(clp);
2058 if (status < 0)
2059 return nfs4_handle_reclaim_lease_error(clp, status);
2060 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2061 nfs4_state_start_reclaim_nograce(clp);
2062 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2063 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2064 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2065 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2066 return 0;
2067}
2068
2069static int nfs4_purge_lease(struct nfs_client *clp)
2070{
2071 int status;
2072
2073 status = nfs4_establish_lease(clp);
2074 if (status < 0)
2a6ee6aa 2075 return nfs4_handle_reclaim_lease_error(clp, status);
b42353ff
TM		 2076 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2077 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2078 nfs4_state_start_reclaim_nograce(clp);
2a6ee6aa 2079 return 0;
02860014
TM		 2080}
2081
c9fdeb28
CL		 2082/*
2083 * Try remote migration of one FSID from a source server to a
2084 * destination server. The source server provides a list of
2085 * potential destinations.
2086 *
2087 * Returns zero or a negative NFS4ERR status code.
2088 */
a52458b4 2089static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
c9fdeb28
CL		 2090{
2091 struct nfs_client *clp = server->nfs_client;
2092 struct nfs4_fs_locations *locations = NULL;
2093 struct inode *inode;
2094 struct page *page;
2095 int status, result;
2096
2097 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2098 (unsigned long long)server->fsid.major,
2099 (unsigned long long)server->fsid.minor,
2100 clp->cl_hostname);
2101
2102 result = 0;
2103 page = alloc_page(GFP_KERNEL);
2104 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2105 if (page == NULL || locations == NULL) {
2106 dprintk("<-- %s: no memory\n", __func__);
2107 goto out;
2108 }
2109
2b0143b5 2110 inode = d_inode(server->super->s_root);
1976b2b3
OK		 2111 result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
2112 page, cred);
c9fdeb28
CL		 2113 if (result) {
2114 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2115 __func__, result);
2116 goto out;
2117 }
2118
2119 result = -NFS4ERR_NXIO;
90e12a31
OK		 2120 if (!locations->nlocations)
2121 goto out;
2122
c9fdeb28
CL		 2123 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2124 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2125 __func__);
2126 goto out;
2127 }
2128
8aafd2fd 2129 status = nfs4_begin_drain_session(clp);
1e672e36
WW		 2130 if (status != 0) {
2131 result = status;
2132 goto out;
2133 }
c9fdeb28
CL		 2134
2135 status = nfs4_replace_transport(server, locations);
2136 if (status != 0) {
2137 dprintk("<-- %s: failed to replace transport: %d\n",
2138 __func__, status);
2139 goto out;
2140 }
2141
2142 result = 0;
2143 dprintk("<-- %s: migration succeeded\n", __func__);
2144
2145out:
2146 if (page != NULL)
2147 __free_page(page);
2148 kfree(locations);
2149 if (result) {
2150 pr_err("NFS: migration recovery failed (server %s)\n",
2151 clp->cl_hostname);
2152 set_bit(NFS_MIG_FAILED, &server->mig_status);
2153 }
2154 return result;
2155}
2156
2157/*
2158 * Returns zero or a negative NFS4ERR status code.
2159 */
2160static int nfs4_handle_migration(struct nfs_client *clp)
2161{
2162 const struct nfs4_state_maintenance_ops *ops =
2163 clp->cl_mvops->state_renewal_ops;
2164 struct nfs_server *server;
a52458b4 2165 const struct cred *cred;
c9fdeb28
CL		 2166
2167 dprintk("%s: migration reported on \"%s\"\n", __func__,
2168 clp->cl_hostname);
2169
f15e1e8b 2170 cred = ops->get_state_renewal_cred(clp);
c9fdeb28
CL		 2171 if (cred == NULL)
2172 return -NFS4ERR_NOENT;
2173
2174 clp->cl_mig_gen++;
2175restart:
2176 rcu_read_lock();
2177 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2178 int status;
2179
2180 if (server->mig_gen == clp->cl_mig_gen)
2181 continue;
2182 server->mig_gen = clp->cl_mig_gen;
2183
2184 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2185 &server->mig_status))
2186 continue;
2187
2188 rcu_read_unlock();
2189 status = nfs4_try_migration(server, cred);
2190 if (status < 0) {
a52458b4 2191 put_cred(cred);
c9fdeb28
CL		 2192 return status;
2193 }
2194 goto restart;
2195 }
2196 rcu_read_unlock();
a52458b4 2197 put_cred(cred);
c9fdeb28
CL		 2198 return 0;
2199}
2200
b7f7a66e
CL		 2201/*
2202 * Test each nfs_server on the clp's cl_superblocks list to see
2203 * if it's moved to another server. Stop when the server no longer
2204 * returns NFS4ERR_LEASE_MOVED.
2205 */
2206static int nfs4_handle_lease_moved(struct nfs_client *clp)
2207{
2208 const struct nfs4_state_maintenance_ops *ops =
2209 clp->cl_mvops->state_renewal_ops;
2210 struct nfs_server *server;
a52458b4 2211 const struct cred *cred;
b7f7a66e
CL		 2212
2213 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2214 clp->cl_hostname);
2215
f15e1e8b 2216 cred = ops->get_state_renewal_cred(clp);
b7f7a66e
CL		 2217 if (cred == NULL)
2218 return -NFS4ERR_NOENT;
2219
2220 clp->cl_mig_gen++;
2221restart:
2222 rcu_read_lock();
2223 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2224 struct inode *inode;
2225 int status;
2226
2227 if (server->mig_gen == clp->cl_mig_gen)
2228 continue;
2229 server->mig_gen = clp->cl_mig_gen;
2230
2231 rcu_read_unlock();
2232
2b0143b5 2233 inode = d_inode(server->super->s_root);
b7f7a66e
CL		 2234 status = nfs4_proc_fsid_present(inode, cred);
2235 if (status != -NFS4ERR_MOVED)
2236 goto restart; /* wasn't this one */
2237 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2238 goto restart; /* there are more */
2239 goto out;
2240 }
2241 rcu_read_unlock();
2242
2243out:
a52458b4 2244 put_cred(cred);
b7f7a66e
CL		 2245 return 0;
2246}
2247
05f4c350
CL		 2248/**
2249 * nfs4_discover_server_trunking - Detect server IP address trunking
2250 *
2251 * @clp: nfs_client under test
2252 * @result: OUT: found nfs_client, or clp
2253 *
2254 * Returns zero or a negative errno. If zero is returned,
2255 * an nfs_client pointer is planted in "result".
2256 *
2257 * Note: since we are invoked in process context, and
2258 * not from inside the state manager, we cannot use
2259 * nfs4_handle_reclaim_lease_error().
2260 */
2261int nfs4_discover_server_trunking(struct nfs_client *clp,
2262 struct nfs_client **result)
2263{
2264 const struct nfs4_state_recovery_ops *ops =
2265 clp->cl_mvops->reboot_recovery_ops;
05f4c350 2266 struct rpc_clnt *clnt;
a52458b4 2267 const struct cred *cred;
4edaa308 2268 int i, status;
05f4c350
CL		 2269
2270 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2271
05f4c350 2272 clnt = clp->cl_rpcclient;
05f4c350
CL		 2273 i = 0;
2274
2275 mutex_lock(&nfs_clid_init_mutex);
05f4c350 2276again:
ea33e6c3 2277 status = -ENOENT;
73d8bde5 2278 cred = nfs4_get_clid_cred(clp);
05f4c350
CL		 2279 if (cred == NULL)
2280 goto out_unlock;
2281
2282 status = ops->detect_trunking(clp, result, cred);
a52458b4 2283 put_cred(cred);
05f4c350
CL		 2284 switch (status) {
2285 case 0:
898fc11b
TM		 2286 case -EINTR:
2287 case -ERESTARTSYS:
05f4c350 2288 break;
05f4c350 2289 case -ETIMEDOUT:
150e7260
TM		 2290 if (clnt->cl_softrtry)
2291 break;
df561f66 2292 fallthrough;
150e7260 2293 case -NFS4ERR_DELAY:
05f4c350
CL		 2294 case -EAGAIN:
2295 ssleep(1);
df561f66 2296 fallthrough;
202c312d 2297 case -NFS4ERR_STALE_CLIENTID:
05f4c350
CL		 2298 dprintk("NFS: %s after status %d, retrying\n",
2299 __func__, status);
2300 goto again;
4edaa308 2301 case -EACCES:
d688f7b8
CL		 2302 if (i++ == 0) {
2303 nfs4_root_machine_cred(clp);
2304 goto again;
2305 }
6d769f1e 2306 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
4edaa308 2307 break;
df561f66 2308 fallthrough;
05f4c350
CL		 2309 case -NFS4ERR_CLID_INUSE:
2310 case -NFS4ERR_WRONGSEC:
6d769f1e
JL		 2311 /* No point in retrying if we already used RPC_AUTH_UNIX */
2312 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2313 status = -EPERM;
2314 break;
2315 }
79d852bf 2316 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
05f4c350
CL		 2317 if (IS_ERR(clnt)) {
2318 status = PTR_ERR(clnt);
2319 break;
2320 }
b193d59a
TM		 2321 /* Note: this is safe because we haven't yet marked the
2322 * client as ready, so we are the only user of
2323 * clp->cl_rpcclient
2324 */
2325 clnt = xchg(&clp->cl_rpcclient, clnt);
2326 rpc_shutdown_client(clnt);
2327 clnt = clp->cl_rpcclient;
05f4c350
CL		 2328 goto again;
2329
2330 case -NFS4ERR_MINOR_VERS_MISMATCH:
2331 status = -EPROTONOSUPPORT;
2332 break;
2333
2334 case -EKEYEXPIRED:
05f4c350
CL		 2335 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2336 * in nfs4_exchange_id */
2337 status = -EKEYEXPIRED;
ea33e6c3
TM		 2338 break;
2339 default:
2340 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2341 __func__, status);
2342 status = -EIO;
05f4c350
CL		 2343 }
2344
2345out_unlock:
2346 mutex_unlock(&nfs_clid_init_mutex);
05f4c350
CL		 2347 dprintk("NFS: %s: status = %d\n", __func__, status);
2348 return status;
2349}
2350
76db6d95 2351#ifdef CONFIG_NFS_V4_1
9f594791 2352void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
0400a6b0 2353{
444f72fe
TM		 2354 struct nfs_client *clp = session->clp;
2355
9f594791
TM		 2356 switch (err) {
2357 default:
2358 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2359 break;
2360 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2361 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2362 }
d94cbf6c 2363 nfs4_schedule_state_manager(clp);
0400a6b0 2364}
cbdabc7f 2365EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
0400a6b0 2366
3f10a6af 2367void nfs41_notify_server(struct nfs_client *clp)
ac074835
TM		 2368{
2369 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2370 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2371 nfs4_schedule_state_manager(clp);
2372}
2373
0f79fd6f
TM		 2374static void nfs4_reset_all_state(struct nfs_client *clp)
2375{
2376 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2c820d9a 2377 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
be0bfed0 2378 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
0f79fd6f 2379 nfs4_state_start_reclaim_nograce(clp);
cc0a9843
TM		 2380 dprintk("%s: scheduling reset of all state for server %s!\n",
2381 __func__, clp->cl_hostname);
0400a6b0 2382 nfs4_schedule_state_manager(clp);
0f79fd6f
TM		 2383 }
2384}
2385
2386static void nfs41_handle_server_reboot(struct nfs_client *clp)
2387{
2388 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2389 nfs4_state_start_reclaim_reboot(clp);
cc0a9843
TM		 2390 dprintk("%s: server %s rebooted!\n", __func__,
2391 clp->cl_hostname);
0400a6b0 2392 nfs4_schedule_state_manager(clp);
0f79fd6f
TM		 2393 }
2394}
2395
8b895ce6 2396static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
0f79fd6f 2397{
0f79fd6f 2398 nfs4_reset_all_state(clp);
cc0a9843 2399 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
0f79fd6f
TM		 2400}
2401
8b895ce6
TM		 2402static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2403{
45870d69 2404 nfs4_state_start_reclaim_nograce(clp);
8b895ce6
TM		 2405 nfs4_schedule_state_manager(clp);
2406
2407 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2408}
2409
0f79fd6f
TM		 2410static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2411{
4099287f
TM		 2412 /* FIXME: For now, we destroy all layouts. */
2413 pnfs_destroy_all_layouts(clp);
8ca017c8 2414 nfs_test_expired_all_delegations(clp);
cc0a9843
TM		 2415 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2416 clp->cl_hostname);
0f79fd6f
TM		 2417}
2418
a9e64442 2419static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
0f79fd6f 2420{
b1352905
TM		 2421 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2422 nfs4_schedule_state_manager(clp);
2423
cc0a9843
TM		 2424 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2425 clp->cl_hostname);
0f79fd6f
TM		 2426}
2427
a9e64442
WAA		 2428static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2429{
2430 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2431 &clp->cl_state) == 0)
2432 nfs4_schedule_state_manager(clp);
2433}
2434
0a014a44
TM		 2435void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2436 bool recovery)
0629e370
AB		 2437{
2438 if (!flags)
2439 return;
2c820d9a
CL		 2440
2441 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2442 __func__, clp->cl_hostname, clp->cl_clientid, flags);
0a014a44
TM		 2443 /*
2444 * If we're called from the state manager thread, then assume we're
2445 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2446 * Those flags are expected to remain set until we're done
2447 * recovering (see RFC5661, section 18.46.3).
2448 */
2449 if (recovery)
2450 goto out_recovery;
2c820d9a 2451
111d489f 2452 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
0f79fd6f 2453 nfs41_handle_server_reboot(clp);
8b895ce6
TM		 2454 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2455 nfs41_handle_all_state_revoked(clp);
2456 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
d1c2331e 2457 SEQ4_STATUS_ADMIN_STATE_REVOKED))
8b895ce6 2458 nfs41_handle_some_state_revoked(clp);
d1c2331e
CL		 2459 if (flags & SEQ4_STATUS_LEASE_MOVED)
2460 nfs4_schedule_lease_moved_recovery(clp);
111d489f 2461 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
0f79fd6f 2462 nfs41_handle_recallable_state_revoked(clp);
0a014a44 2463out_recovery:
a9e64442
WAA		 2464 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2465 nfs41_handle_backchannel_fault(clp);
2466 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2467 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
0f79fd6f 2468 nfs41_handle_cb_path_down(clp);
0629e370
AB		 2469}
2470
c3fad1b1
AA		 2471static int nfs4_reset_session(struct nfs_client *clp)
2472{
a52458b4 2473 const struct cred *cred;
c3fad1b1
AA		 2474 int status;
2475
1a47e7a6
TM		 2476 if (!nfs4_has_session(clp))
2477 return 0;
8aafd2fd
TM		 2478 status = nfs4_begin_drain_session(clp);
2479 if (status != 0)
2480 return status;
73d8bde5 2481 cred = nfs4_get_clid_cred(clp);
848f5bda 2482 status = nfs4_proc_destroy_session(clp->cl_session, cred);
c489ee29
TM		 2483 switch (status) {
2484 case 0:
2485 case -NFS4ERR_BADSESSION:
2486 case -NFS4ERR_DEADSESSION:
2487 break;
2488 case -NFS4ERR_BACK_CHAN_BUSY:
2489 case -NFS4ERR_DELAY:
2490 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2491 status = 0;
2492 ssleep(1);
2493 goto out;
2494 default:
f455848a 2495 status = nfs4_recovery_handle_error(clp, status);
c3fad1b1
AA		 2496 goto out;
2497 }
2498
2499 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
848f5bda 2500 status = nfs4_proc_create_session(clp, cred);
41f54a55 2501 if (status) {
cc0a9843
TM		 2502 dprintk("%s: session reset failed with status %d for server %s!\n",
2503 __func__, status, clp->cl_hostname);
f2c1b510 2504 status = nfs4_handle_reclaim_lease_error(clp, status);
41f54a55
AA		 2505 goto out;
2506 }
bda197f5 2507 nfs41_finish_session_reset(clp);
cc0a9843
TM		 2508 dprintk("%s: session reset was successful for server %s!\n",
2509 __func__, clp->cl_hostname);
41f54a55 2510out:
a52458b4 2511 put_cred(cred);
c3fad1b1
AA		 2512 return status;
2513}
76db6d95 2514
a9e64442
WAA		 2515static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2516{
a52458b4 2517 const struct cred *cred;
2cf047c9
TM		 2518 int ret;
2519
1a47e7a6
TM		 2520 if (!nfs4_has_session(clp))
2521 return 0;
8aafd2fd
TM		 2522 ret = nfs4_begin_drain_session(clp);
2523 if (ret != 0)
2524 return ret;
73d8bde5 2525 cred = nfs4_get_clid_cred(clp);
2cf047c9 2526 ret = nfs4_proc_bind_conn_to_session(clp, cred);
a52458b4 2527 put_cred(cred);
43ac544c 2528 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
bf674c82
TM		 2529 switch (ret) {
2530 case 0:
cc0a9843
TM		 2531 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2532 __func__, clp->cl_hostname);
bf674c82
TM		 2533 break;
2534 case -NFS4ERR_DELAY:
2535 ssleep(1);
2536 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2537 break;
2538 default:
2539 return nfs4_recovery_handle_error(clp, ret);
2540 }
2541 return 0;
a9e64442 2542}
b5fdf841
TM		 2543
2544static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2545{
2546 int iomode = 0;
2547
2548 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state))
2549 iomode += IOMODE_READ;
2550 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state))
2551 iomode += IOMODE_RW;
2552 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2553 if (iomode) {
2554 pnfs_layout_return_unused_byclid(clp, iomode);
2555 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2556 }
2557}
76db6d95 2558#else /* CONFIG_NFS_V4_1 */
c3fad1b1 2559static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
a9e64442
WAA		 2560
2561static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2562{
2563 return 0;
2564}
b5fdf841
TM		 2565
2566static void nfs4_layoutreturn_any_run(struct nfs_client *clp)
2567{
2568}
76db6d95
AA		 2569#endif /* CONFIG_NFS_V4_1 */
2570
e005e804 2571static void nfs4_state_manager(struct nfs_client *clp)
02860014 2572{
3e17898a 2573 unsigned int memflags;
02860014 2574 int status = 0;
8ed27d4f 2575 const char *section = "", *section_sep = "";
02860014 2576
3e17898a
TM		 2577 /*
2578 * State recovery can deadlock if the direct reclaim code tries
2579 * start NFS writeback. So ensure memory allocations are all
2580 * GFP_NOFS.
2581 */
2582 memflags = memalloc_nofs_save();
2583
02860014 2584 /* Ensure exclusive access to NFSv4 state */
47c2199b 2585 do {
511ba52e 2586 trace_nfs4_state_mgr(clp);
aeabb3c9 2587 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2c820d9a 2588 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
8ed27d4f 2589 section = "purge state";
b42353ff 2590 status = nfs4_purge_lease(clp);
2a6ee6aa
TM		 2591 if (status < 0)
2592 goto out_error;
b42353ff 2593 continue;
2c820d9a
CL		 2594 }
2595
b42353ff 2596 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
8ed27d4f 2597 section = "lease expired";
b79a4a1b
TM		 2598 /* We're going to have to re-establish a clientid */
2599 status = nfs4_reclaim_lease(clp);
2a6ee6aa 2600 if (status < 0)
b79a4a1b 2601 goto out_error;
b42353ff 2602 continue;
e598d843
TM		 2603 }
2604
c3fad1b1 2605 /* Initialize or reset the session */
1a47e7a6 2606 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
8ed27d4f 2607 section = "reset session";
4d643d1d 2608 status = nfs4_reset_session(clp);
b6d408ba
TM		 2609 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2610 continue;
2611 if (status < 0)
76db6d95 2612 goto out_error;
76db6d95 2613 }
b6d408ba 2614
a9e64442
WAA		 2615 /* Send BIND_CONN_TO_SESSION */
2616 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1a47e7a6 2617 &clp->cl_state)) {
8ed27d4f 2618 section = "bind conn to session";
a9e64442
WAA		 2619 status = nfs4_bind_conn_to_session(clp);
2620 if (status < 0)
2621 goto out_error;
bf674c82 2622 continue;
a9e64442
WAA		 2623 }
2624
5df904ae
TM		 2625 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2626 section = "check lease";
2627 status = nfs4_check_lease(clp);
2628 if (status < 0)
2629 goto out_error;
8faaa6d5 2630 continue;
c9fdeb28
CL		 2631 }
2632
2633 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2634 section = "migration";
2635 status = nfs4_handle_migration(clp);
2636 if (status < 0)
2637 goto out_error;
5df904ae
TM		 2638 }
2639
b7f7a66e
CL		 2640 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2641 section = "lease moved";
2642 status = nfs4_handle_lease_moved(clp);
2643 if (status < 0)
2644 goto out_error;
2645 }
2646
b79a4a1b 2647 /* First recover reboot state... */
e345e88a 2648 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
8ed27d4f 2649 section = "reclaim reboot";
591d71cb 2650 status = nfs4_do_reclaim(clp,
c48f4f35 2651 clp->cl_mvops->reboot_recovery_ops);
df817ba3 2652 if (status == -EAGAIN)
b6d408ba
TM		 2653 continue;
2654 if (status < 0)
2655 goto out_error;
df817ba3 2656 nfs4_state_end_reclaim_reboot(clp);
02860014
TM		 2657 }
2658
45870d69
TM		 2659 /* Detect expired delegations... */
2660 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2661 section = "detect expired delegations";
2662 nfs_reap_expired_delegations(clp);
2663 continue;
2664 }
2665
b79a4a1b 2666 /* Now recover expired state... */
67e7b52d 2667 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
8ed27d4f 2668 section = "reclaim nograce";
591d71cb 2669 status = nfs4_do_reclaim(clp,
c48f4f35 2670 clp->cl_mvops->nograce_recovery_ops);
df817ba3 2671 if (status == -EAGAIN)
b6d408ba
TM		 2672 continue;
2673 if (status < 0)
b79a4a1b 2674 goto out_error;
67e7b52d 2675 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1da177e4 2676 }
707fb4b3 2677
3e17898a 2678 memalloc_nofs_restore(memflags);
5601a00d 2679 nfs4_end_drain_session(clp);
aeabb3c9
TM		 2680 nfs4_clear_state_manager_bit(clp);
2681
b5fdf841 2682 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) {
aeabb3c9
TM		 2683 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2684 nfs_client_return_marked_delegations(clp);
2685 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2686 }
b5fdf841
TM		 2687 nfs4_layoutreturn_any_run(clp);
2688 clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state);
707fb4b3 2689 }
e005e804 2690
4dc73c67
N		 2691 return;
2692
a1aa09be 2693 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
21a446cf
TM		 2694 goto out_drain;
2695
1da177e4 2696out_error:
8ed27d4f
WAA		 2697 if (strlen(section))
2698 section_sep = ": ";
511ba52e 2699 trace_nfs4_state_mgr_failed(clp, section, status);
8ed27d4f
WAA		 2700 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2701 " with error %d\n", section_sep, section,
2702 clp->cl_hostname, -status);
ffe5a830 2703 ssleep(1);
21a446cf 2704out_drain:
3e17898a 2705 memalloc_nofs_restore(memflags);
5601a00d 2706 nfs4_end_drain_session(clp);
e005e804
TM		 2707 nfs4_clear_state_manager_bit(clp);
2708}
2709
2710static int nfs4_run_state_manager(void *ptr)
2711{
2712 struct nfs_client *clp = ptr;
4dc73c67
N		 2713 struct rpc_clnt *cl = clp->cl_rpcclient;
2714
2715 while (cl != cl->cl_parent)
2716 cl = cl->cl_parent;
e005e804
TM		 2717
2718 allow_signal(SIGKILL);
4dc73c67
N		 2719again:
2720 set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
e005e804 2721 nfs4_state_manager(clp);
4dc73c67
N		 2722 if (atomic_read(&cl->cl_swapper)) {
2723 wait_var_event_interruptible(&clp->cl_state,
2724 test_bit(NFS4CLNT_RUN_MANAGER,
2725 &clp->cl_state));
2726 if (atomic_read(&cl->cl_swapper) &&
2727 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2728 goto again;
2729 /* Either no longer a swapper, or were signalled */
2730 }
2731 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
2732
2733 if (refcount_read(&clp->cl_count) > 1 && !signalled() &&
2734 test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) &&
2735 !test_and_set_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state))
2736 goto again;
2737
e005e804 2738 nfs_put_client(clp);
e005e804 2739 return 0;
1da177e4 2740}
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